Citat från HP Wiki-artikeln om Tobias Snape :
Tobias had a very poor relationship with both his wife and his son; when Severus was younger, Tobias frequently shouted at and hit Eileen whilst Severus crouched in a corner, crying. The memory of watching his parents fighting would haunt Severus even into adulthood, as witnessed during an Occlumency lesson given by him to Harry Potter.
It is likely that Tobias was equally abusive or at the very least neglectful of Severus, given how much Severus despised all Muggles. Even at a very young age, Severus noticed with pain how his parents fought; it caused him a great deal of distress, and he was quite happy to be able to leave the house to visit his friend Lily Evans.
The fact that Tobias lived near a textile mill may have given some indication of his occupation or socioeconomic status. Tobias's eventual fate is unknown, although it is likely that he had died by 1996. Tobias may have been an alcoholic or drug addict, or might have been unemployed, given how he frequently abused his wife and son, lived in a slum neighbourhood and his son wore ill-fitting, dirty clothes.
Det var allt som var fallet, vilket hindrade Severus Snape från att bli en Obscurus?
Eftersom han inte försökte undertrycka sin kraft.
En Obscurus bildas i en mycket specifik omständighet - när den unga häxan eller trollkarlen aktivt försöker undertrycka sina magiska förmågor. Inte för bara allmänt missbruk - medan det definitivt kommer att få negativa effekter på barnet och de är förmodligen växande upp emotionellt (och eventuellt fysiskt) ärriga om de inte försöker undertrycka sin magi, då Obscurus kommer inte att bildas.
JACOB: Can someone please tell me what this Obscurial - Obscurus - thing is? Please?
TINA: There hasn't been one in centuries.
NEWT: I met one in Sudan three months ago. There used to be more of them, but they still exist. Before wizards went underground, when we were still being hunted by Muggles, young wizards and witches sometimes tried to suppress their magic to avoid persecution. Instead of learning to harness or to control their powers, they developed what was called an Obscurus. It's an unstable, uncontrollable Dark force that bursts out an attacks... and then vanishes.
Fantastic Beasts and Where to Find Them (2016) (source)
Medan Snape säkert fick missbruk ...
When Lily asked Young Snape if his dad, the Muggle Tobias, liked magic, Snape's answer was short but said a whole lot: 'He doesn't like anything much.'
Pottermore
... det finns inga bevis för att han försökte undertrycka sin magi på grund av detta missbruk.
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